Editing Tcsh (section)

==Significant features==
*Command history
**The built-in <code>history</code> command displays the previously entered commands
**Use of {{Keypress|UP}} / {{Keypress|DOWN}} at the command line to allow the user to select a command from the history to edit/execute
**Invoking previous commands using [[command history]]
***<code>!!</code> executes the previous command
***<code>!n</code> executes the nth command that was previously executed
***<code>!-n</code> executes the command that was executed ''n'' commands ago
***<code>!''string''</code> executes the most recently executed command that starts with ''string''
***<code>!?''string''</code> executes the most recently executed command that contains ''string''
**Using history in new commands
***<code>!*</code> - refers to all of the arguments from the previous command
***<code>!$</code> - refers to the last argument from the previous command
***<code>!^</code> - refers to the first argument from the previous command
***<code>!:n</code> - refers to the n<sup>th</sup> argument from the previous command
***<code>!:m-n</code> - refers to the m<sup>th</sup> through n<sup>th</sup> arguments from the previous command
***<code>!:n-$</code> - refers to the n<sup>th</sup> through the last argument from the previous command
*Command line editing
*Auto-completion of file names and variables as well as programmable completion at the command line
*Alias argument selectors; the ability to define an alias to take arguments supplied to it and apply them to the commands that it refers to.  Tcsh is the only shell that provides this feature (in lieu of functions).
**<code>\!#</code> - argument selector for all arguments, including the alias/command itself; arguments need not be supplied.
**<code>\!*</code> - argument selector for all arguments, excluding the alias/command; arguments need not be supplied.
**<code>\!$</code> - argument selector for the last argument; argument need not be supplied, but if none is supplied, the alias name is considered to be the last argument.
**<code>\!^</code> - argument selector for first argument; argument MUST be supplied.
**<code>\!:n</code> - argument selector for the n<sup>th</sup> argument; argument MUST be supplied; n=0 refers to the alias/command name.
**<code>\!:m-n</code> - argument selector for the arguments from the m<sup>th</sup> to the n<sup>th</sup>; arguments MUST be supplied.
**<code>\!:n-$</code> - argument selector for the arguments from the n<sup>th</sup> to the last; at least argument n MUST be supplied.
**<code>\!:n*</code> - argument selector for the arguments from the n<sup>th</sup> to the last; sufficient arguments need not be supplied.<syntaxhighlight lang="csh">
#Alias the cd command so that when you change directories, the contents are immediately displayed.
alias cd 'cd \!* && ls'
</syntaxhighlight>
*Wildcard matching<syntaxhighlight lang="csh">
if ( "$input" =~ [0-9]* ) then
  echo "the input starts with an integer"
else
  echo "the input does NOT start with an integer"
endif
</syntaxhighlight>
*Job control
*The built-in <code>where</code> command.  Works like the <code>which</code> command but shows '''all''' locations of the target command in the directories specified in <code>$PATH</code> rather than only the one that will be used.